docker错误
错误:cannot enable tty mode on non tty input
错误产生:
root@machine1:/data# echo test|docker exec -i 68b cat test root@machine1:/data# echo test|docker exec -it 68b cat cannot enable tty mode on non tty input
问题在于,当使用-it时,容器为我们分配了伪终端,等待我们从终端输入数据到伪终端的标准输入。但我们的输入方式却不是从终端,有可能是重定向和管道。官网对于it参数的解释:
-t
and -i
.The
-t
flagassigns a pseudo-tty or terminal inside our new container and the
-i
flagallows us to make an interactive connection by grabbing the standard in (
STDIN
)of the container.
In foreground mode (the default when -d
is not specified), docker
can start the process in the container and attach the console to the process’s standard input, output, and standard error. It can even pretend to be a TTY (this is what most command line executables expect) and pass along signals. All of that is
run
configurable:
-a=[] : Attach to `STDIN`, `STDOUT` and/or `STDERR`
-t=false : Allocate a pseudo-tty
--sig-proxy=true: Proxify all received signal to the process (non-TTY mode only)
-i=false : Keep STDIN open even if not attached
If you do not specify -a
then Docker will attach
all standard streams. You can specify to which of the three standard streams (STDIN
, STDOUT
, STDERR
)
you’d like to connect instead, as in:
$ docker run -a stdin -a stdout -i -t ubuntu /bin/bash
For interactive processes (like a shell), you must use -i -t
together
in order to allocate a tty for the container process. -i -t
is
often written -it
as you’ll see in later examples. Specifying -t
is
forbidden when the client standard output is redirected or piped, such as in: echo
.
test | docker run -i busybox cat
解决方法:某些情况下it不能同时使用
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